Polynuclear and Mononuclear Complex Formation between Indium (III) and Sulfhydryl-containing Bidentate Ligands

概要

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The various physico-chemical studies were made on the complex-formation equilibria between In (III) and sulfhydryl-containing bidentate ligands, such as 2-aminoethanethiol (2-mercaptoethylamine, MEA), 3-mercaptopropionic acid (MPA), and mercaptoacetic acid (thioglycolic acid, TGA). The insoluble and stable complex, InL_3,was formed during the titration of the MEA-In (III) solution. The complex formation of In (III) with MPA and TGA was investigated by potentiometric titration over a wide range of the metal concentration. Calculation of the titration data of the MPA-In (III) system indicated that MPA formed the In_2L_3,In_3L_4,and In_3 (OH) L_4 species together with the mononuclear species. In the higher concentration, non-charged species, In_3 (OH) L_4,was precipitated. In the alkaline solution, the carboxyl group was eliminated from the coordination sphere and the InL_4 species was formed. These observations in the MPA-In (III) system were similar to those of the cysteine case. Since TGA forms the stable complex with fivemembered chelate ring, the InL_4 or hydrolyzed species were not formed even in the alkaline solution. Calculation indicated the formation of the InL_3,In_2L_3,and In_3L_5 species in the TGA system.
社団法人日本薬学会の論文
1978-02-25